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Pink patch lawn fungus5/26/2023 ![]() Under wet conditions, pink, cottony tufts of mycelium and conidia (spores) may be produced. In dry conditions, the stroma become brittle, are easily broken and detached, and may be spread by equipment or fall into the thatch where they remain viable for up to two years. A mix of healthy and diseased grass blades gives the turf a ragged appearance. The red thread pathogen produces a red or dark pink stroma (a structure consisting of fungal mycelium and plant tissue) which can be seen with the naked eye on infected leaves. Symptoms of pink patch and red thread appear as roughly circular, pinkish red to tan patches, 2-4 inches in diameter. ![]() Both diseases occur on turf that is growing slowly because of low fertility, lack of sunlight, drought, or other sources of stress. While the two diseases sometimes occur together, pink patch is uncommon in the Northeast. Pink patch was once considered to be a form of red thread due to similarities in symptoms, disease cycle, epidemiology, host range, and appearance. Pink patch, caused by Limonomyces roseipellis, is a different disease which closely resembles red thread. ![]() Red thread is caused by the fungus Laetisaria fuciformis.
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